Saw-filing machine.



G. K. KAWAHARA.

SAW FILING MACHINE.

APPLICATION FILED JULY 17, 190B.

2 SHEETS-SHEET 1.

Suva/"tor,

eozyeK/ awfiam G. K. KAWAHARA.

SAW FILING MAGHINE.

APPLICATION FILED JU-LY17, 190a.

- Pafcented Apr. 6, 1909.

2 SHEETSSHEET 2.

' saw indicated vide novel an GEORGE KOSA KAWAHARA, OF PASADENA, CALIFORNIA.

I SAW-FILING MACHINE.

Specification of Letters Patent.

Patented April 6, 1.909.

Application filed July 17, 1908. Serial No. 444,032.

To all whom it may concern:

Be it known that I, GEORGE K. KAWA- HARA, a citizen of the United States of America, residing at Pasadena, in the county of Los Angeles and State of California, have invented new and useful Improvements in Saw-Filin Machines, of which the following is a speci cation.

This invention relates to saw filing machines, the object of the invention being to iprovide a simple and practical machine for ling and sharpening saws which is adapted to be readily applied to and removed from an ordinary work bench upon which the saw filing machine is supported during its operation.

A further ob'ect of the invention is to roeffective means for 1101 ing theteeth of the saw in engagement with the file during the filing peration, while a still further object of the invention is to so mount the hand-operating mechanism with relation to the saw guide and holder that the line of strain ap lied to the frame of the machine by thehan operation thereof is in the same direction as the length of the saw.

With the above and other objects in view, theinvention consists in the novel construction, combination and'arrangement of parts as hereinafter fully described, illustrated and claimed.

In the accompanying drawings,Fi ure 1 is a front elevation of a saw filing mac ine embodying the present invention, the supporting bench being illustrated by dotted ines. Fig. 2 is an end view of the machine shown applied to the work bench and illustrating a saw in cross section. Figs. 3 andA. are fragmentary plan views of different forms of rotary files.

'The filing machineof this invention comprises essentially a split guide 0st or saw guide l-havin a central space 2 1n whichthe at 3 is slidingly received, whereby said saw may be moved in the direction of its length as it is subjected to the action of the file. The post 1 is provided on one side with a bench clamp comprising 'a fixed jaw 4 and a clamp screw 5 which passes through a threaded opening in a lug or extension 6 formed at the bottom of the guide post, the screw 5 being preferably provided with a swiveled head 7 adapted to engage against the top of the bench on'th'e side 0 osite the stationary jaw 4. In this way t e ing machine as a whole is firmly fastened Extending laterally away from the post 1 I is a bifurcated arm 8 between which the saw blade is also adapted to pass, and said arm is provided at its extremity with an upstanding caring 9 for one end of an arbor 10 upon he which the rotary file 11- is mounted.

arbor 10 is journaled in another bearing 12 arranged at the opposite end of the rotary file and formed by an upwardly extending bracket arm 13, the latter being provided at its u per end with a bearin 14 for the shaft 15 o a worm wheel 16, t e shaft 15 also havin fast thereon a hand-operating crank 17. he worm wheel 16 meshes with a worm 18 fast on the arbor 10, and in this way rotary motion is imparted to the arbor 10 and file 11 thereon. S acing collars 19 are interposed between t e bearing 9 and one end of the file 11 and a retainer 20 on the adj acent end of the arbor, which retainer may be in the form of a nut. Other spacing collars 21 are arranged at opposite sides of the bear- I ing 12, one between said bearing and the adjacent end of the worm 18. -By means of the construction just described it will be observed that the force applied to the op-' ,of the machine.

It is designed to employ several kinds of rotary files 11, one form of which is shown in Fig. 1 as ada ted for saw blades having coarse teeth. lhe file illustrated in Fig. 3

is shown as provided with finer teeth for 05- crating on a saw having teeth of correspon ing gage, the file shown in Fig. 3 being especially adapted for cross-cut saws. Both of the files shown in Figs. 1 and 3 are rovided with spirally arranged cutting teet 'which, in the rotary movement of the file, operate to advance the saw blade lengthwise, operating successively on the teeth thereof. In the form illustrated in Fig. 4, the teeth of the file extend circumferentially around the body of the file and are especially adapted for the filing of rip saws. Under the arrangement shown in Fig. 4, the file does not act to advance the saw blade, the latter havin to be advancedby hand periodically after ing or sharpening a certain number of teeth thereof, corresponding with the number of teeth on the rotary file.

By reference to Fig. 2 it will be observed that the u per'portion of the space 2 of the 0st in w 1ch the saw blade is received is fiared, as shown at 22 to allow for the lateral swaging of the saw teeth. The teeth of the saw are held ieldin ly in engagement with the teeth of t e file y means of an adjustable tension device consisting of a spring 23 carrying at the extremity thereof a tension roller '24 adapted to bear against the back edge of the saw, as clearly illustrated in Figs. 1 and 2. The tension device also comprises a short inclined arm 25 which is received slidingly in an inclined socket in the foot extension 26 at the-bottom of the saw guide or guide post 1, the arm 25 of the spring being retained in osition by means of a set screw 27 passing t irough a threaded opening in the foot extension 26 and binding against the arm 25, thereby providing for adjusting the pressure of the spring against the saw. The spring arms 23 and 25 of the tension device are connected by a coil 28 involving one or more convolutions to impart the necessary resiliency to the longer arm 23 of the s ring. By the means described the saw. bla e is urged toward the rotary file to effect the necessary pressure between the teeth of the rotary file and the teeth of the saw to produce the necessary abrasive action which results in the pro er and accurate sharpening and jointing o the saw teeth.

By reference to Figs. 1 'and 3 it will be observed that a right hand file is shown in one of said figures while a left hand file is illustrated in the other figure. It will also be noted that the teeth on the file are of sufficient size to bridge two of the teeth on the saw. Therefore, in filing a saw, it is first fed along in one direction and subjected to the action of the right hand file, for example, after which the left hand file is inserted 1n. the machine and the saw is fed in the opposite direction. This provides for filing the saw teeth at the proper pitch and also insures the uniform filing of the teeth and bringing the same to aunlform height.

Having thus described the invention, what is claimed as new, is

A saw filing machine comprising a bifurcated saw guiding post, a bifurcated arm extendin upward from said post, a mandrel journa ed on said arm and an upward exten-- sion on the post, a rotary file carried by the mandrel, hand-o erated means for actuating said mandre, a foot extension at the bottom of the guide post having an inclined socket, and a'tension spring supported by said foot extension and acting to urge the saw toward the file, said spring comprising an inclined terminal portion which is adjustable in said inclined socket.

In testimony whereof I aflix my signature in presence of two witnesses.

' GEORGE KOSA KAWAHARA. Witnesses:

HARRY TOKUTARO NAG-AFUCHI,

ARATA NARITOMI. 

